结合注塑模具设计实例，介绍杠杆先复位机构，并导出了杠杆先复位机构设计计算公式。
This article introduces the previous returning mechanism of lever and deduces the calculation formula about the mechanism with injection molding design as an example.
介绍了一种新型的先复位机构，其结构简单，动作可靠，加工方便，非常适合塑料模具使用。
A new_type pre_reset mechanism was introduced. With simple structure, reliable action and convenient operation, it is well fit for the injection mould.
方法100例纵裂磨牙采用先对患牙初步清理复位带环固定根管治疗后全冠修复保存患牙。
Methods100 molars with vertical fracture were cleaned and fixed by metallic ring. Then root canal treatment (RCT) were completed.
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